Worst experience with a manager was with this project manager at my first job.

One day the other developers and I were staying back a little late to try to make some progress. The manager offered to go out to get food for us. It must have been two hours later when we realized he was not back. We were ready to go home and starting to get hungry. We called him and he said he got caught up but was on his way back and would be there soon. It was more than an hour later when he arrived with the food. I quit that job shortly after.